Would you say something or respect grandmother in law....

My husband hasn't heard from his mother on years. She went to prison almost 16 years ago killing his dad. He hasn't spoken to her since and hates her. A couple weeks ago I spoke to his dad's mom (my husband's Nona). My husband was always more hurt about his dad's death and mad at him than his Nona was. Which didn't make a whole lot of sense since he was her son. I was over there because we were trying to figure out what to do for my husband's birthday. We got on the conversation of his mother and she actually had GOOD things to say about his mother. I wouldn't have good things to say about a women who killed my son. When I asked why she talked so fondly of her after what she did she said it's more complicated than anyone, even my husband knows. I let it go for a bit but a few hours later I asked what she meant. She said she loves me and she couldn't have a luckier granddaughter in law and she was gonna tell me something that had to stay between us. She told me her son was molesting in both my husband and his brother when they were younger. My husband never mentioned that to me. His Nona said his mom had told her she caught him doing it to them in their sleep... His mom and her were close and she told her even though that's her son she should call the police, but his mom decided to take it into her own hands. She had talked with his mom and his mom told her not to tell the boys because they don't deserve that type of trauma. She was gonna tell the boys but they were so young and already hurting and their mom begged her not to. I think she should tell them! They are old enough to handle it! But his Nona told me to keep it to myself and it will just cause them both more pain....

Seriously... Would any of you keep this to yourself. I'm glad me and his Nona have such a close bond and she trust me but I feel like I his is something you don't keep to yourself?!

I guess I see why staying out if it is a good idea... I just can't imagine having your child hate you when you were trying to protect them and they don't even know the truth